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這篇英文論文主要介紹了基于TI公司TMS320C24x的直流無刷電機控制。A complete solution proposal is
presented below: control structures, power hardware topology, shaft
position sensors, control hardware and remarks on energy conversion
efficiency can be found in this document.
標簽：
presented
complete
solution
proposal
上傳時間：
2013-12-24
上傳用戶：極客
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We describe and demonstrate an algorithm that takes as input an
unorganized set of points fx1 xng IR3 on or near an unknown
manifold M, and produces as output a simplicial surface that
approximates M. Neither the topology, the presence of boundaries,
nor the geometry of M are assumed to be known in advance — all
are inferred automatically from the data. This problem naturally
arises in a variety of practical situations such as range scanning
an object from multiple view points, recovery of biological shapes
from two-dimensional slices, and interactive surface sketching.
標簽：
demonstrate
unorganized
algorithm
describe
上傳時間：
2013-12-18
上傳用戶：xc216
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The advantages of automation can be exploited in order to solve or to
minimize the needs of manual approach. In order to support the development of
survey accurate cadastral system, an automatic programming approach will be
adopted. Database selection system will conduct several outliers integrity
checking, rebuild cadastral spatial topology (cadastral lot) and make selfcorrection
procedures based on cadastral survey concepts and mathematical
model respective to the cadastral lots selected. This is to ensure that all cadastral
lots are kept in a closed polygon and provide accurate and "clean" cadastral
information.. This system was developed in windows environment.
標簽：
advantages
automation
exploited
minimize
上傳時間：
2017-04-29
上傳用戶：520
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With the Wireless module, OPNET can model both
terrestrial and satellite radio systems. In this tutorial,
you will use Modeler and Wireless modeling to create a
radio network you will also observe variations in the
quality of received signal that results from radio noise
at the receiving node in a dynamic network topology.
標簽：
terrestrial
satellite
Wireless
systems
上傳時間：
2017-08-06
上傳用戶：xwd2010
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In the next generation of wireless communication systems, there will be a need for the rapid
deployment of independent mobile users. Significant examples include establishing survivable, efficient,
dynamic communication for emergency operations, disaster relief efforts, and military networks. Such
network scenarios cannot rely on centralized and organized connectivity, and can be conceived as
applications of mobile ad hoc networks. A MANET is an autonomous collection of mobile users that
communicate over relatively bandwidth constrained wireless links. Since the nodes are mobile, the
network topology may change rapidly and unpredictably over time. The network is decentralized, where
all network activity including discovering the
標簽：
communication
generation
the
wireless
上傳時間：
2014-01-07
上傳用戶：cuibaigao
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matlab有限元網格劃分程序
DistMesh is a simple MATLAB code for generation of unstructured triangular and tetrahedral meshes. It was developed by Per-Olof Persson (now at UC Berkeley) and Gilbert Strang in the Department of Mathematics at MIT. A detailed description of the program is provided in our SIAM Review paper, see documentation below.
One reason that the code is short and simple is that the geometries are specified by Signed Distance Functions. These give the shortest distance from any point in space to the boundary of the domain. The sign is negative inside the region and positive outside. A simple example is the unit circle in 2-D, which has the distance function d=r-1, where r is the distance from the origin. For more complicated geometries the distance function can be computed by interpolation between values on a grid, a common representation for level set methods.
For the actual mesh generation, DistMesh uses the Delaunay triangulation routine in MATLAB and tries to optimize the node locations by a force-based smoothing procedure. The topology is regularly updated by Delaunay. The boundary points are only allowed to move tangentially to the boundary by projections using the distance function. This iterative procedure typically results in very well-shaped meshes.
Our aim with this code is simplicity, so that everyone can understand the code and modify it according to their needs. The code is not entirely robust (that is, it might not terminate and return a well-shaped mesh), and it is relatively slow. However, our current research shows that these issues can be resolved in an optimized C++ code, and we believe our simple MATLAB code is important for demonstration of the underlying principles.
To use the code, simply download it from below and run it from MATLAB. For a quick demonstration, type "meshdemo2d" or "meshdemond". For more details see the documentation.
標簽：
matlab有限元網格劃分程序
上傳時間：
2015-08-12
上傳用戶：凜風拂衣袖
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The ability to analyze system or circuit behavior is one of the key requirements for
successful design. To put an idea to work, a designer needs both the knowledge
and tools for analyzing the behavior of that new system architecture or that experi-
mental circuit topology. Design decisions are grounded on the results obtained from
analysis.
標簽：
Frontends
Telecom
上傳時間：
2020-06-01
上傳用戶：shancjb
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This document provides general hardware and layoutconsiderations and guidelines for hardware engineersimplementing a DDR3 memory subsystem.The rules and recommendations in this document serve as aninitial baseline for board designers to begin their specificimplementations, such as fly-by memory topology.
標簽：
ddr3
上傳時間：
2021-11-21
上傳用戶：
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以AT89S52單片機為控制核心,采用電容降壓技術,Buck電路拓撲,PWM驅動模塊和功率器件散熱設計,通過高速的數據采集、主功率輸入輸出模塊和控制模塊,設計一種新型智能車載充電器.在充電過程中,通過負脈沖瞬間放電實現對鉛酸蓄電池的再生修復,提高電池的有效容量,延長使用壽命.該充電器體積小、速度快、效率高、可靠性好.With AT89S52 single chip computer as the control core,a new type of intelligent car-carried charger was designed by using capacitance step-down technology,Buck circuit topology,PWM driving module and power device heat dissipation design,through high-speed data acquisition,main power input and output module and control module.In the charging process,the regeneration and repair of lead-acid batteries are realized by instantaneous discharge of negative pulse,which improves the effective capacity of batteries and prolongs their service life.The charger has the advantages of small size,fast speed,high efficiency and good reliability.
標簽：
車載充電器
上傳時間：
2022-03-27
上傳用戶：
-
通過采用無橋PFC和半橋LLC諧振變換器作為數字開關電源的主變換拓撲,基于STM32系列微控制器的全數字控制PFC和DC-DC變換器,首先對數字化開關電源方案進行對比,然后闡述了200W數字開關電源整體方案,并對數字開關電源的無橋PFC和半橋LLC變換器進行系統研究。By using a bridgeless PFC and a half-bridge LLC resonant converter as the main conversion topology of the digital switching power supply,the all-digital control PFC and DC-DC converter based on the STM32 series of microcontrollers,firstly the digital switching power supply scheme is compared,and then the overall scheme of 200 W digital switching power supply is expounded, and the bridgeless PFC and half-bridge LLC converter of digital switching power supply are systematically studied.
標簽：
數字開關電源
上傳時間：
2022-04-02
上傳用戶：qingfengchizhu
